I've pulled this into the dma-mapping for-next tree now to make
progress. Any further review comments should be dealt with in
incremental patches.
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While most architectures are either always or never dma coherent for a
given build, the arm, arm64, mips and soon arc architectures can have
different dma coherent settings on a per-device basis. Additionally
some mips builds can decide at boot time if dma is coherent or not.
I've started to look
